versa 055B, Installation & Operating Instructions Manual, Page: 18 / 36

18
External Auxiliary Bypass Valve
(Where Required)
An auxiliary bypass valve should be used when flow
rates exceed 60 gpm (usually a high performance
pump size larger than 1-1/2 HP will exceed this flow
rate). This valve is required to complement the func-
tion of the automatic bypass valve, particularly when
starting the heater in winter or early spring when the
spa or pool temperature is down below 55°F. It also
serves to eliminate needless pressure drop through
the heater and accompanying reduction in the flow
rate to the spa jets, etc.
Auxiliary Bypass Valve Adjustment
To set bypass: With clean filter, adjustment is made by
feeling the inlet and outlet pipes at the heater. Outlet
pipes should be slightly warmer than inlet and comfort-
able to the touch. If pipe is hot, close bypass; if cold,
open bypass
Pressure Relief Valve Installation
To conform to local building codes, it may be neces-
sary to install a pressure relief valve. A 3/4" pressure
relief valve having a capacity equal to BTUH/HR out-
put of the model to be installed is recommended for
this appliance.
Electrical Wiring
Millivolt System
The Millivolt System Residential Heater is equipped
with a self-generating electrical system in which the
electric current is provided by means of a pilot gener-
ator. No external electrical connections are required.
When installing a remote switch, do not exceed 10 ft.
of wiring from the heater. Use 18-gauge stranded wire.
Electronic Intermittent Ignition
Device (IID) System
The Electronic Intermittent Ignition Device automati-
cally lights the pilot and main burners upon a call for
the heat. The heater is supplied with a dual-voltage
transformer for 120V or 240V input power hookup.
From Heater To Heater
l o o P m o r F l o o P o T
Auxiliary Bypass Valve (do not use gate valve)
Fig. 17: Auxiliary Bypass Valve
Drain Pipe Drain Pipe
Heater Outlet Heater Outlet
Fig. 18: Pressure Relief Valve Installation
NOTE:
To avoid water damage or scalding due to
valve operation, drain pipe must be connected to
valve outlet and run to a safe place of discharge.
Drain pipe must be the same size as the valve
discharge connection throughout its entire length
and must pitch downward from the valve. No shut-off
valve shall be installed between the relief valve and
the drain line. Valve lever should be tripped at least
once a year to ensure that waterways are clear.
NOTE:
If it is necessary to replace any of the
original wiring, it must be replaced with 105°C wire or
its equivalent, except all black wire must be replaced
with 150°C wire or its equivalent.
NOTE:
When the electrical hookup to the heater
requires both 24V and 120V or 240V, each input
voltage must be isolated in a separate conduit.
NOTE:
IID Propane Units Only Heater is equipped
with an electronic ignition device with a 100% safety
lockout feature. If the heater fails to start or lockout,
reset the ignition device by interrupting the power to
the heater for 60 seconds.
CAUTION:
If service replacement of the electronic
ignition device is required, replace only with a 100%
safety lockout device with 90-second trial for pilot
ignition.